Spray head



M y 1930- J. E. PERRIN 1,760,373

SPRAY HEAD Filed March 14, 1927 Patented May 27, 1930 UNITED STATESPATENT OFFICE JAMES E. PERRIN, 0F TOLEDO, OHIO, ASSIGNOR TO THE DEVILBISS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO SPRAY HEADApplication filed March 14, 1927.

This invention relates to spray-heads for use particularly in connectionwith spraying devices for applying materials in spray form to surfacesto be coated.

In devices of this character it is customary to discharge supplementalair jets against opposite sides of the main surface coating spray streamto effect a flattening and broadening thereof, or to create what iscommonly referred to as a fan spray.

The object of this invention is the provision in a spray-head of thischaracter of simple, eflicient and novel means for completely opening orclosing the supplemental air discharge jets, or regulating the pressureof discharge of air therefrom, as conditions may require.

The invention is fully described in the following specification and oneembodiment thereof. illustrated in the accompanying drawings, in which,

Figure 1 is a side elevation of a spray-head embodying the inventionwith a part in central longitudinal section. Fig. 2 is a front endelevation thereof, and Fig. Sis a section on the line 33 in Fig. 1.

Referring to the drawings, 1 designates the portion of a spray-gun bodyto which the s 'n'ay-head is attached and which with the spray-head, inthe present instance, may be considered as the spray-head unit, inasmuchas it detachable as a unit from the spraygun body proper. The assembledconnection with a spray-gun body of such a unit equipped with adiii'erent construct-ion of spray-head is illustrated in U. S. LettersPatent No. 1,613,588, dated January 1, 1927.

The body member 1 is provided at its forward end with an eniargement 2,which, in the present instance, is externally threaded to permit theengagement therewith of a union nut 8. The body 2 has an axiallydisposed bore or passage 4 therein for communicating through a nipple 5and any suitable connection with a source'of supply of the material tobe sprayed. The inner or material discharge nozzle 6 of the spray-headis threaded into the forward end of the body member bore 4 andhas itsforward end reduced and terminating in a restricted discharge nippleSerial No. 175,140.

7 with its discharge passage in communication with the bore a, as wellunderstood in the art.

The outer or air discharge nozzle 8 is of cup form having thecylindrical cavity or air space 9 in its rear side and having its forardside provided with a centrally disposed air discharge orifice 10 throughwhich the nipple T centrally projects in spaced relation thereto. Theunion nut 3 engages the. rear end of the nozzle 8 and holds it seated,in the present instance, against a conical seating surface 11 of thebody member enlargement 2 in a manner to permit a turning of the nozzlerelative to the body member. The air chamber 9 of the nozzle 8 is incommunica' tion with a source of air pressure supply through a passage12 in the enlargement 2.

Provision is made between the forward ends of the nozzles 6 and 8 forthe passage of air from the space 9 to the air discharge orilice 10. Thenozzle 8 also has provision for the discharge of su 'oplemental airstreams from the space 9 through two supplementai air passages 13disposed at opposite sides of the nozzle axis. The outer ends of thesepassages are disposed to direct their streams of air into opposedflattening engagement with the main material. laden stream issuing fromthe central orifices of the two nozzles. The inner ends of the passages13 open into an annular channel 14 provided in the inner side of theouter end wall of the nozzle 8, such channel being in communication withthe air space 9.

A cylindrical or ring valve 15 is threaded in the nozzle 8 within thespace 9 and has its forward end projecting into the channel 1 1 andadapted to seat against the bottom of such channel and close thecommunication between the air space 9 and supplemental air passages 13.The inner side of the annular portion of the valve 15, which projectsinto the channel lt, coacts with the inner wall 16 of said channel toregulate the flow of airbetween the space 9 and passages 13, the wall 16being tapered for that purpose, so that as the valve is turnedrearwardly the space between it and the wall 16 is gradually broadened.When the valve is seated, it may coact with the inner end portion of thewall 16 to completely close the communication between the space 9 andpassages 13.

The inner nozzle 6 has a portion disposed within the air space 9 of theouter nozzle which is straight for a distance axially of the nozzles andis projected through an inturned flange 17 provided at the inner or rearend portion of the valve 15, so that the valve may have slidingmovements lengthwise of the inner nozzle. The engagement. of the nozzle6 and flange 17 of the valve is such, however, that they are preventedfrom having relative turning movements. For this purpose, the coactingsurfaces of the two members may be hexagonal, as shown, or of any othersuitable irregular form. Holes 18 may be provided through the valveflange 17 for the passage of air from one side to the other thereof.

It is apparent that a turning of the outer nozzle member 8 relative tothe body member 1 and nozzle 6 will eiiect an axial adjustment of thevalve 15 due to the threaded engagement of the valve with the nozzle 8and the anchoring of the valve against turning relative to the innernozzle. It is also apparent that either by reason of the pitch of thethread between the nozzle 8 and valve 15 or by reason of the incline ofthe wall 16 of the channel 14-, the nozzle 8 may be turned aconsiderable extent without any material change in the pressure ofdischarge of air from the supplen'iental passages 13. This is importantin order that the nozzle 8 may be turned to vary the plane of flattening of the main spray stream within substantially a 360 adjustmentwithout perceptibly or materially varying the pressure of discharge ofthe air streams from the supplemental passages.

I wish it understood that my invention is not limited to any specificconstruction, arrangement or form of the parts, as it is capable ofembodiment in difierent forms without departing from the spirit of theclaims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a spray-head of the class described, inner and outer nozzlesmounted for rela tive rotary adjustment and the outer nozzle havingsupplemental air discharge passages, 11 valve between the nozzles forregulating the discharge of air from the supplemental passages andmovable by a relative turning of the nozzles, to open or close saidpassages or to vary the discharge of air therefrom, the actuatedmovements of the valve being relative to both nozzles.

2. In a spray-head of the class described, inner and outer relativelyrotatable nozzles, the outer nozzle having supplemental air dischargepassages, a valve mounted within the outer nozzle in connection withboth of said nozzles and operable to have axial movements to open orclose the air passages and to regulate the discharge of air therefrom bya relative turning of the nozzles.

3. In a spray-head of the class described, an inner material dischargenozzle, an outer air discharge nozzle having air space therein adaptedto have communication with a source of air pressure supply and havingsupplemental air discharge passages, a valve mounted within the outernozzle and operable to have movements axially of the sprayhead to openor close said passages and to regulate the pressure of discharge of airtherefrom by a relative turning of the nozzles 4. In a spray-head of theclass described, inner and outer relatively rotatable nozzles forming anair space therebetween, adapted to have communication with a source ofair pressure supply, the outer nozzle having supplemental air dischargepassages, and a valve disposed in said air space for controlling thedischarge of air from said passages, said valve being threaded to one ofsaid nozzles and having sliding engagement with a stationary part of thespray-head, whereby a turning of the nozzle to which the valve isthreaded will impart axial movement to the valve to regulate thedischarge of air from said passages.

5. In a spray-head, an air discharge nozzle having supplemental airdischarge passages, a valve threaded in said nozzle for relative rotaryand axial movements and adapted by its axial movements to control thedischarge of air from said passages, and stationary means with which thevalve has axial sliding but non-rotatable movements when the outernozzle is rotated.

6. In a spray-head of the class described,

' an outer air discharge nozzle having an air space therein adapted tohave communication with a source of air pressure supply, an annularchannel in the bottom of said space at the forward end of the nozzle,and supplemental air passages leading from said channel, one sidewall ofsaid channel being tapered, a ring valve threaded in the nozzle andhaving a portion extending into said channel and cooperating with saidtapered wall to regulate the pressure and quantity of air discharge fromsaid passages when the valve and nozzle have relative axial adjustmentby a relative turning thereof, and means within the valve permittingaxial movements of the same but preventing rotation thereof.

7 In a spray-head of the class described, inner and outer nozzlescooperating to form an air space therebetween ada )ted to havecommunication with a source 0 air pressure supply, said nozzles beingrelatively rotatable and the outer nozzle having an annular channel inthe forward end of said air space provided with a tapered sidewall andhaving supplemental air discharge passages leading from said channel, avalve mounted in said air space and cooperating with the tapered Wall ofsaid channel to control the communi cation between said air space andpassages when the valve is axially moved, said valve having engagementWith said nozzles to cause an axial adjustment of the valve when thenozzles are relatively adjusted.

8. In a spray-head, an outer nozzle having an air space therein adaptedto have communication with a source of air pressure supply and havingsupplemental air discharge passages from said space and a valve mountedWithin said space for movements axially of the nozzle for controllingthe discharge of air from said passages, said nozzle having a taperedsidewall coacting With the valve to permit greater or less volume of airto pass to the passages from said space when the valve is axially moved.

In testimony whereof I have hereunto signed my name to thisspecification.

JAMES E. PERRIN.

